17-BETA-HYDROXYSTEROID-OXIDOREDUCTASE

17-BETA-HYDROXYSTEROID-OXIDOREDUCTASE
Does any one know of any existing vitamins , minerals etc... that can
inhibit 17-BETA-HYDROXYSTEROID-OXIDOREDUCTASE 's ability to turn
androstenedione into testosterone ?
Zinc , saw palmetto ,vitamin b 6 are known to have inhibitory effect on
testosterone's conversion to dihytestosterone by preventing 5 alpha
reductase from doing its job.
Thanks
ref: 17-BETA-HYDROXYSTEROID-OXIDOREDUCTASE